Example code of switching panel implemented by js_javascript skills

Recently, I watched the js video of Miaowei Classroom and learned a little knowledge. I will summarize it here. The code is a bit bloated. I just started learning and I don’t know how to optimize it. If you see the experts, you can give me some advice. Haha, thank you again. However,
the effect is probably like this:

When you mouse over different questions, there will be different pictures and explanations, which can be connected to different websites.
Share my code :

My little broken car

• Chinese detailed explanation


• Detailed explanation of mathematics


• php order


• c evil supplement